65. 



Genus Ditylenchus Filipjev, 193U 

 (Key to the species modified from Filipj. & Stekh. 19)4l) 



1. Tail pointed at the end in both sexes 2 



Tail obtusely rounded at the end in the female sex 16 



2. Body slender (a=32-60); body width 1.7-3.2^ of body length 3 



Body plump (a=20-3l) : body width 3.3-^'^ of body length 8 



3. Bursa rudimentary darbouxi (Cotte, 1912) Filipj., 1936 



Bursa copulatrix well developed h 



k» Esopha.-^us well developed; gubemaculim in profile very thin, but long 



intermedius (de l^an, 1880) Filipjev, 1936 



Esophagus in adult form, especially in males, is weak, not strongly 

 muscular; gubemaculum short and thj ck 5 



5. Bursa ending a short distance in front of tip of tail 6 



Bursa ouite wrapping in the tail 



. TJrocerus (Bally & Reydon, 1931) Filipjev, 1936 



6. Lateral field with h incisures; tail terminus acute 



djpsaci (Kuhn, 18^7) Filipjev, 1936 



Lateral field with 6 incisures; tail terminus finely rounded. ... 7 



7. Postvulvar uterine sac about 2|- times Amlvar body diameter in lenr^th 



destruct or Thome, 19^45 



Postvulvar uterine sac less than 2 times vulvar body diameter in 

 length myceliophar;us J, Goodey, 1958 



8. Bursa not quite wrapning in the tail 9 



Bursa quite wraoping in the tail 15 



9. Vulva (=V) between 75-85^^ of body length 10 



Vulva between 86-96^ of body length 12 



10. Spicula provided with a thick sheath; body long; V=71-8l^ 



radicicola (Greeff, 1872) Filipjev, 1936 



Spicula not provided with such a sheath 11 



11. Heads of spicula hardly offset; male tail about 2 l/3 anal body diam- 

 eters long phyllobius (Thome, 193U) Filipjev, 1936 



Heads of spicula distinctly offset, barbed; male tail about 3^ anal 

 body diameters long angustus (Butler, 1913) Filipjev, 1936 



12. Vulva far posterior at 96^ of body length 



pustulicola (Thome, 193ii) Filipjev, 1936 



Vulva between 86-905? ' 13 



13. Body length of both male and female less than lOOOu 



arboricolus (Cobb, 1922) Filipjev, 1936 



Body length over lUOOu l)i 



